line

line

1. a stripe, streak, or narrow ridge; sometimes only an imaginary connector between two anatomic landmarks. Called also linea. adj., adj lin´ear.

2. tubing on a catheter.

absorption l's dark lines in the spectrum due to absorption of light by the substance through which the light has passed.

arterial line a monitoring system that uses an artery for access and consists of a catheter in the artery, pressure tubing, a transducer, and an electronic monitoring device. The most common uses of arterial lines are for monitoring of systemic blood pressure and obtaining arterial blood for analysis.

Beau's l's transverse lines or grooves in the nail plate caused by various systemic and local traumatic factors.

Beau's line. From Polaski and Tatro, 1996.

bismuth line a thin blue-black line along the gingival margin in bismuth poisoning.

iliopectineal line the ridge on the ilium and pubes showing the brim of the true pelvis.

incremental l's lines supposedly showing the successive layers deposited in a tissue, as in the tooth enamel.

intertrochanteric line one running obliquely from the greater to the lesser trochanter on the anterior surface of the femur.

Langer's l's linear clefts in the skin indicative of the direction of the fibers; they correspond closely to the creases of the body but vary with body configuration. Lines of incision made parallel to them are thought to heal more efficiently. Called also cleavage lines.

lip line a line on the teeth at the level to which the margin of either lip extends.

median line an imaginary vertical line dividing the body equally into right and left parts.

milk line the line of thickened epithelium in the embryo along which the mammary glands are developed.

mylohyoid line a ridge on the inner surface of the lower jaw from the base of the symphysis to the ascending rami behind the last molar tooth.

nuchal l's three lines (inferior, superior, and highest) on the outer surface of the occipital bone.

pectinate line one marking the junction of the zone of the anal canal lined with stratified squamous epithelium and the zone lined with columnar epithelium.

semilunar line a curved line along the lateral border of each rectus abdominis muscle, marking the meeting of the aponeuroses of the internal oblique and transverse abdominal muscles.

Shenton's line a curved line seen in radiographs of the normal hip, formed by the top of the obturator foramen; it is used to determine the relationship between the head of the femur and the acetabulum.

temporal l's curved ridges, inferior and superior, on the external surface of the parietal bone, continuous with the temporal line of the frontal bone, a ridge that extends upward and backward from the zygomatic process of the frontal bone.

terminal line one on the inner surface of each pelvic bone, from the sacroiliac joint to the iliopubic eminence anteriorly, separating the false from the true pelvis.

visual line a line from the point of vision of the retina to the object of vision; called also visual axis.

line

a subpopulation with certain characteristics in common. Thus a population of insects might be divided into several lines, depending on their tolerance to insecticides, and each line may be further inbred.

line

1. The connection between two points. 2. In anatomy, a long narrow band or streak that is distinct from the surrounding tissues by colour or texture.base line The line joining the centres of rotation of the two eyes. It is approximately equal to the interpupillary distance (Fig. L20). Seeinterocular distance.demand line The line in Donders' diagram that represents the perfect amount of convergence required for each level of accommodation, for single binocular vision. Syn. orthophoria line; Donders' line.line of direction Line joining an object in space with its image on the retina (allowing for the optical properties of the eye). The line joining the fixation point to the fovea is called the principal line of direction. However, the object appears to lie along a visual direction and that direction in visual space associated with the fovea is called the principal visual direction. All other visual directions associated with other retinal points are called secondary visual directions. The principal line of direction and the principal visual direction coincide, but the former indicates the direction towards the eye, while the latter indicates the direction away from the eye. Seelaw of identical visual directions.Donders' lineSeedemand line.Egger's lineSeeligament of Wieger.Ferry's line A line containing iron located in the corneal epithelium and adjacent to limbal filtering blebs. It may occur as a result of trabeculectomy.line of fixationSeefixation axis.Fleischer's lineSeeFleischer's ring.focal line Any astigmatic optical system produces two mutually, usually perpendicular, focal lines of a point object. The focal lines are situated at different image distances. Each focal line lies parallel to its associated cylinder axis. Syn. image line; line focus; Sturm's line. Seecircle of least confusion; conoid of Sturm; interval of Sturm.line focusSeefocal line.Fraunhofer's line's Fine dark lines distributed throughout the length of the solar spectrum due to the absorption of specific wavelengths by elements in the atmosphere of the sun and the earth. Fraunhofer observed about 600 of these lines and denoted the most prominent ones by letters from A in the extreme red to K in the violet. Examples: A corresponds to 759.4 nm, C to 656.3 nm, D to 589.3 nm, F to 486.1 nm, etc. Seeconstringence; solar spectrum.line of Gennari A distinctive white stripe in the middle of the fourth layer of the visual cortex containing the termination of the optic radiation fibres, as well as intracortical connections. The stripe appears above and below the calcarine fissure except in the most anterior part of the fissure where it only appears below. Syn. area striata; stria of Gennari. Seevisual area; calcarine fissure.Hudson-Stähli line A yellowish-brown, more or less horizontal line containing iron which runs across the cornea below the centre. It occurs in normal corneas, more frequently in the elderly, or in association with corneal opacities.iron line Deposits of iron within the corneal epithelium appearing as a brown rust line. They often subside with time leaving a nebulous scar. Several eponymous types have been described depending on the cause and location. SeeHudson-Stähli line; Stocker's line; Coat's white ring; Fleischer's ring; siderosis bulbi.median line Line formed by the intersection of the median plane and the plane of regard (Fig. L20). Syn. midline.orthophoria lineSeedemand line.phoria line On Donders' diagram, it is the line joining all the points representing the passive position of the eyes corresponding to various levels of accommodation.principal line of visionSeeline of sight.pupillary lineSeepupillary axis.retinal line Operationally, the collection of retinal elements that are activated in response to a line stimulus.Sampaolesi's line A pigmented, wavy line anterior to Schwalbe's ring and found mainly in the periphery of the inferior cornea. It may be noted with gonioscopy in pigmentary dispersion syndrome and pseudoexfoliation syndrome.line of SchwalbeSeeanterior limiting ring of Schwalbe.line of sight Line joining the point of fixation to the centre of the entrance pupil. This line is more practical than the visual axis. Syn. principal line of vision.line spectrumSeeline spectrum.Stocker's line An abnormal line containing iron located in the corneal epithelium which may appear in front of the advancing edge of a pterygium.Sturm's lineSeefocal line.visual lineSeevisual axis.

Fig. L20 Base line C1 C2 and median line. The base line is situated about 13

n a ridge of osseous structure on the body of the mandible extending from the anterolateral border to the mandibular ramus, passing downward and forward, after covering the buccocervical portion of the mandibular third molar, and ending by blending into the molar teeth.

line, finish,

n in cavity preparations, a minimal line of demarcation of the wall of the preparation at the cavosurface angle; usually results from a slice made by an abrasive disk.

line focus,

n a principle employed in the design of radiographic tubes, by which the effective focal spot is sharply reduced relative to the actual (larger) focal spot desirable to deal with the heat generated. It involves focusing the cathode stream, in the pattern of a thin rectangle, onto an anode truncated at about 20° to the transverse axis of the tube. See also spot, focal, effective.

line, fulcrum,

n an imaginary line around which a removable partial denture tends to rotate.

line, fulcrum, anteroposterior,

n an imaginary line of rotation extending through the rest and other support areas along the same side of a removable partial denture.

line, fulcrum, cross arch,

n an imaginary line through the tooth-supported rest areas nearest to soft tissue-supported areas and around which the partial denture will tend to rotate when forces are applied to the soft tissue-supported areas.

line, lead,

n a bluish-black patch on the gingival tissues, usually about 1 mm from the gingival crest. Caused by the deposition of fine granules of lead sulfide in the tissues. A sign of lead absorption in lead poisoning (plumbism).

line, median,

n the intersection of the midsagittal plane with the maxillary and mandibular dental arches. The center line divides the central body surface into right and left.

line, mercurial,

n a linear area of abnormal pigmentation of the gingival tissues associated with mercury poisoning. Seen along the gingival margin, it has been variously described as bluish, brownish, dirty reddish, or purplish in coloration.

line, neonatal,

n the microscopic imbrication line on a primary tooth marking the point at which prenatal growth stops and postnatal growth begins. See line, Owen contour.

line of credit,

n an arrangement whereby a financial institution (bank or insurance company) commits itself to lend up to a specified maximum amount of funds during a specified period. The interest rate on the loan may be specified or not. Sometimes a commitment fee is imposed for obtaining the line of credit.

line of draw,

n the direction or plane of withdrawal or seating of a removable or cemented restoration.

line of force,

n See force, line of.

line of occlusion,

n the alignment of the occluding surfaces of the teeth in the horizontal plane. See also plane, occlusal line.

line of Retzius,

n.pr one of several microscopic incremental lines appearing in the mature enamel.

line, Owen contour,

n.pr one of a series of adjoining microscopic imbrication lines in dentin that demonstates a disturbance in body metabolism. See line, neonatal.

line, petrous

(pet´rəs), n the line traced around the hard, dense portion of temporal bone that forms a case protecting the inner ear.

line printer,

n a fast printing device. A line printer prints on paper each line of characters in one operation, rather than character by character.

line, protrusive,

n one of the three tracings made on each of the six projection planes of a jaw motion data recorder.

line, survey,

n a line produced on the various portions of a dental cast by a surveyor, scriber, or marker. It designates the greatest height of contour in relation to the orientation of the cast to the vertical scriber.

line, vibrating,

n the imaginary line across the posterior part of the palate marking the division between the movable and relatively immovable tissues of the palate.

line

1. a stripe, streak, mark, or narrow ridge; often an imaginary line connecting different landmarks. See also linea.

2. conversion of a broad beam of x-rays to a pencil beam.

3. a single consignment of livestock from one farm. Said of a group of cattle or sheep notable for their homogeneity.

absorption l's

dark lines in the spectrum due to absorption of light by the substance through which the light has passed.

line block

a nerve block of local anesthesia produced by infiltrating the anesthetic along a line that the incision is to take.

a system of handling carcasses in an abattoir. The carcasses move along an overhead chain line past a series of stations where the dressing and meat inspection is done.

line focus

utilization of a broad beam of electrons for the generation of x-rays by a rotating anode so that the area of the target on which the electrons fall is spread over a line instead of a point.

gingival line

1. a line determined by the level to which the gingiva extends on a tooth; called also gum line.

2. any linear mark visible on the surface of the gingiva.

gum line

gingival line (1).

iliopectineal line

the ridge on the ilium and pubes showing the brim of the true pelvis.

incremental l's

lines supposedly showing the successive layers deposited in a tissue, as in the tooth enamel.

intertrochanteric line

one running obliquely from the greater to the lesser trochanter.

lead line

a bluish line at the edge of the gums in lead poisoning. Rarely seen in animals.

median line

an imaginary vertical line dividing the body equally into right and left parts.

milk line

1. the line of thickened epithelium in the embryo along which the mammary glands are developed.

2. the metal tube in a milking machine along which the milk, after extraction from the cow, passes to the storage vat.

mylohyoid line

a ridge on the inner surface of the lower jaw from the base of the symphysis to the ascending rami behind the last molar tooth.

pectinate line

one marking the junction of the zone of the anal canal lined with stratified squamous epithelium and the zone lined with columnar epithelium.

physeal line

one on the surface of an adult long bone, marking the junction of the epiphysis and diaphysis.

pleural reflection line

line of the junction between costal and diaphragmatic pleurae.

semilunar line

a curved line along the lateral border of each rectus abdominis muscle, marking the meeting of the aponeuroses of the internal oblique and transverse abdominal muscles.

temporal line

a curved ridge on the external surface of the cranium that marks the origin of the temporal muscle.

terminal line

one on the inner surface of each pelvic bone, from the sacroiliac joint to the iliopubic eminence cranially, separating the false from the true pelvis, and marking the pelvic inlet.

line transects

a technique for estimating the density of a population, e.g. the number of deer per hectare in a gamepark.

visual line

a line from the point of vision of the retina to the object of vision; called also visual axis.

Patient discussion about line

Q. My vision is blurry and I see zigzag lines, what is it from? Every now and again, usually after sitting a few hours in front of the computer or not sleeping enough at night, I start getting blurry vision. I see zigzag lines in front of my eyes and it can take sometimes an hour to go away. What is this from?

A. It sounds like you have a migraine. A migraine that comes with blurry vision and zigzags (an aura) is called a classic migraine. The aura of migraine typically lasts from 20 minutes to an hour. Some patients have prolonged aura symptoms that can last hours to days. The aura also typically ends before the headache itself begins. When migraine aura symptoms are prolonged or last into or through the headache phase these types of migraine are commonly referred to as complicated migraines.

Q. what is the red line when your body temperature drops before you are getting hypothermia?

A. Hypothermia is a condition in which an organism's temperature drops below that required for normal metabolism and function. For people in stage 1 hypethermia, body temperature drops by 1-2°C below normal temperature (35-36°C). Mild to strong shivering occurs. In stage 2, body temperature drops by 2-4°C (35-33 degrees). Shivering becomes more violent. Muscle mis-coordination becomes apparent and movements are slow and labored and there is mild confusuin. In stage 3, body temperature drops below approximately 32 °C (89.6 °F). Shivering usually stops and there's difficulty speaking, sluggish thinking, and amnesia start to appear. Cellular metabolic processes shut down. This is life threatening.

Q. can i get lung cancer from second hand smoking? what is the red line amount? how long do i need to expose to a smoking environment before i risk lung cancer ?

A. Yes, second hand (or passive) smoking is indeed a risk factor for lung cancer. How much? It depends both on the environment of the passive smoking (e.g. to how many smokers one is exposed) and on genetic factors. Don't know about threshold, but it seems that the more you avoid it the better.

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